Mercurial > gnulib
view tests/test-pwrite.c @ 40167:c1aa6d1185ea
strtold: Add tests.
* tests/test-strtold.c: New file, based on tests/test-strtod.c.
* modules/strtold-tests: New file.
author | Bruno Haible <bruno@clisp.org> |
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date | Wed, 30 Jan 2019 03:53:43 +0100 |
parents | b06060465f09 |
children |
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/* Test the pwrite function. Copyright (C) 2009-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ #include <config.h> #include <unistd.h> #include "signature.h" SIGNATURE_CHECK (pwrite, ssize_t, (int, const void *, size_t, off_t)); #include <sys/types.h> #include <fcntl.h> #include <errno.h> #include <string.h> #include "macros.h" #define N (sizeof buf - 1) int main (void) { char const *file = "out"; int fd; char buf[] = "0123456789"; off_t pos = 2; size_t i; off_t init_pos; ASSERT (file); fd = open (file, O_CREAT | O_WRONLY, 0600); ASSERT (0 <= fd); ASSERT (write (fd, buf, N) == N); ASSERT (close (fd) == 0); fd = open (file, O_WRONLY, 0600); ASSERT (0 <= fd); init_pos = lseek (fd, pos, SEEK_SET); ASSERT (init_pos == pos); for (i = 0; i < N; i+=2) { const char byte = 'W'; ASSERT (pwrite (fd, &byte, 1, i) == 1); ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos); } { /* Invalid offset must evoke failure with EINVAL. */ const char byte = 'b'; ASSERT (pwrite (fd, &byte, 1, (off_t) -1) == -1); ASSERT (errno == EINVAL); } ASSERT (close (fd) == 0); { fd = open (file, O_RDONLY); ASSERT (0 <= fd); ASSERT (read (fd, buf, N) == N); ASSERT (close (fd) == 0); ASSERT (strcmp ("W1W3W5W7W9",buf) == 0); } /* Test behaviour for invalid file descriptors. */ { char byte = 'x'; errno = 0; ASSERT (pwrite (-1, &byte, 1, 0) == -1); ASSERT (errno == EBADF); } { char byte = 'x'; close (99); errno = 0; ASSERT (pwrite (99, &byte, 1, 0) == -1); ASSERT (errno == EBADF); } return 0; }